Engine compartment insulation

[6cuda6]

Hi folks,

Im looking for suggestions on the best product to insulate my engine compartment for heat and noise BUT i need to do it from inside the engine
compartment not inside the coach as i dont want to pull all the great carpet the PO installed.
--
Rich Mondor,

Brockville, ON

77 Hughes 2600

 

[Agoogol]

I may be a newbie here, and with my GMC, but you want access from the inside.
--
Kevin
1977 Kingsley
Centennial CO

 

[Ken H.]

You'll probably get a lot of good suggestions, but I'l tell you what I did
20 years ago that's worked quite well ever since: Since I had the engine
compartment empty, including the wheel well liners, anyway, I used "duct
board" to cover every flat surface, horizontal and vertical. Duct board is
a 3/4" thick rigid fiberglass matt covered on one side with an aluminized
mesh. The material is rigid enough that it's used as its name suggests:
To build HVAC ducts -- they just make the ducts from it and duct tape. I
put the covered side down to prevent oil absorption, for waterproofing, and
for thermal protection. The upper, exposed fiberglass matt, I sprayed well
with 3M contact cement augmented here and there with fender washers and
drywall screws. I sealed the exposed edges with aluminum foil duct tape.

I'd feared I'd have trouble with the fiberglass becoming saturated with
water and/or oil, but have had no problem whatsoever -- turns out the
underside of the floor stays pretty clean and dry. If I were doing it
again, I'd cover the exposed side with thin aluminum sheeting. I've
knocked holes in the surface with several things, including pressure washer
spray. But after 20 years, I really have no complaint.

I'd be very reluctant to try to insulate the underside with anything
without gutting the compartment. Just my bias/laziness.

Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com

On Fri, Sep 27, 2019 at 6:34 PM tonka6cuda6--- via Gmclist <

> Hi folks,
>
> Im looking for suggestions on the best product to insulate my engine
> compartment for heat and noise BUT i need to do it from inside the engine
> compartment not inside the coach as i dont want to pull all the great
> carpet the PO installed.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[johnny]

My 23' had the same stuff, installed by Sirum for the PO. Worked well.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell

 

[Ken B]

What every you do DO NOT USE BUBBLE WRAP.

I use to have small strips of that stuff (about 1/2" x 4") that I would use as a demonstration at the end of the few seminars. I set a match to the
stuff and stunk up the room badly. About the only thing that would have been worse would have been using gasoline on the coach. I really caught hell
over that one time, and have not been asked to do any seminars since then.

I had a gasoline fueled engine fire in my coach about 10 years ago. The bill to St Farm was over $10,000 to fix it and I did the work cheap. I had
insulated mine with a product called micro-foil made by Northern Ohio Foam Products. It looks like bubble wrap but it will not sustain a fire. The
stuff held up very well when my engine caught fire. It was easy to install and had good heat rejection. It was rather thin and did not do too much
for sound deadening.

http://www.nofp.com/insulation-products/microfoil

I did a group buy of this stuff 12-13 years ago and I got to see them make this stuff. My coach was full of rolls of this stuff when I left. A bunch
of us GMCers met for a lunch in Michigan that weekend where we divided it up among about 10 or 12 of us.

They will UPS it to you and it use to be they would sell partial rolls to you if you told them you wanted it for a GMC motorhome. They took a tour of
my GMC while I was there. That was years ago so I do not know if they do that any more.

They will send you small samples if you call them. I used up all of my samples in fire demonstrations along side of bubble wrap.


--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[steve southworth]

Here's how id did mine using duct board.

http://www.gmcmhphotos.com/photos/g6094-engine-compartment-insulation.html

I also insulated under the floor section over the exhaust pipes using the same duct board. The areas directly over the exhaust pipes was has
additional insulation using sheet metal (pole barn sheet metal).

This would be a very difficult installation with the engine in place.
--
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

 

[6cuda6]

Why do i get the feeling this isnt going to be a fun job with the motor in place.
--
Rich Mondor,

Brockville, ON

77 Hughes 2600

 

[johnny]

Because it's gonna be a P I A, get your arms greasy, and teach you some new vocabulary. But, still less hassle than pulling the motor and
transmission out first.

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell